835966-UIM-E-0814
Johnson Controls Unitary Products
19
FIGURE 19:
Thermostat Wiring – Two-Stage Heat Pump - Variable Speed Modulating Furnace
HP 28A
Two Stage Heat Pump – Variable Speed Modulating Furnace (With Hot Heat Pump Operation)
O
Reversing Valve
Energized in Cool
C
24 – Volt Common
R
24 – Volt Hot
W1 OUT
First Stage Heat
W2 OUT
Second Stage Heat
Y2 OUT
Second Stage Compressor
Y1
Single Stage Compressor
X/L
Malfunction Light
Y2
Second Stage Compressor
W
Auxiliary Heat
BS
Bonnet Sensor
BSG
Bonnet Sensor
YORKGUARD VI
CONTROL
TWO STAGE
HEAT PUMP
Bonnet Sensor
(Optional)
C
24 – Volt Common
Y1
First Stage Compressor
G
Fan
THERMOSTAT
R
24 – Volt Hot
W3
Third Stage Heat
C
24 – Volt Common
R
24 – Volt Hot
Y1
Single Stage Compressor
VARIABLE SPEED
MODULATING
FURNACE CONTROL
G
Fan
VARIABLE SPEED
MODULATING
FURNACE
Y/Y2
Second or Full
Stage Compressor
HUM
Dehumidification-
Open on Humidity Rise
W
Modulating Heat
Move HUMIDISTAT
jumper to “YES”
if humidistat is to be used.
ID MODELS
OD MODELS
YZH
H*8B
Change Hot Heat Pump
jumper on the heat pump
control to “ON”
A015-001
S1-THSU32HP7b
Fault
Y2
Second Stage
Compressor
W2
Second Stage Heat
W1/O/B
First Stage Heat
HUM
DHUM
Jumper 1 must be set
to “HEATPUMP”
Jumper 2 must be set
to “O”
Jumper 3 must be set
to “GAS”
Setup Step 50 “Dual
Fuel” must be set
“External”
Change “FFuel” jumper
on the heat pump control
to ‘ON”
YPLC
LPLC
CPLC
TPLC
YP9C
LP9C
CP9C
TP9C
YZF060
H*6B60